ISSN:
1572-8927
Keywords:
Proton transfer
;
aqueous-urea-NaCl solutions
;
excited state dissociation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The rates of proton dissociation from the first excited state of aromatic alcohols (8-hydroxypyrene-1,3,6-trisulfonate and β-naphthol-6-sulfonate) were measured by steady-state fluorimetry in aqueous solutions as a function of urea concentration. The measured acid dissociation rate constants (k off /* ) of the probes were independent of urea concentration up to 3M. These results, together with the decrease of k off /* with salt and other additives, demonstrate that the changes in k off /* are not related unequivocally with the activity of water. A urea-H2O cluster of properties similar to pure water is proposed to account for the observed results.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647263
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